What is a new moon?

The new moon is an astronomical phenomenon, which refers to the situation that on the first day of each month in the lunar calendar, when the moon moves between the sun and the earth, the moon faces the earth with its shadow, rises and falls with the sun, and the moon cannot be seen on the earth.

The new moon does not see the moon, and so does the full moon on the fifteenth.

The new moon is the first moon. In astronomical terms, the new moon is the yellow meridian of the moon and the sun (the yellow meridian of the sun refers to the earth's orbit around the sun). ) the simultaneous phases of the moon, that is, the moon, the sun and the earth are on the same line. That is, when the moon is in the middle (assuming that the sun is on the left and the earth is on the right), it blocks the sun's light more (when the three balls are roughly in a line), and the moon seen by people on the hemisphere facing away from the sun is the new moon. At the new moon, the front of the moon is facing the sun and the dark hemisphere of the moon is facing the earth, so the moon can't be seen on the earth.

The original meaning of the word "new moon" is the eyebrow moon that is first seen after the moon and the sun merge into one. This happened before the sun set on the western horizon, that is, a short time after sunset, so the date of the new moon and the exact time when the event can be seen are closely related to the geographical position of the observer. The astronomical new moon, sometimes called the Black Moon to avoid confusion, is defined as invisible from the earth when the sun and the moon have the same ecliptic. This moment is unique and has nothing to do with geographical location. In some cases, there will be a solar eclipse.